Transmission won't go into a gear

Transmission-clutch interlock disconnected would do that.

Sorry, I don’t know where it is on that tractor but first try pushing the clutch lever hard forward to brake the transmission input (clutch) shaft and get the most travel on the interlock if it’s still hooked up.

Someone will be along soon that knows where to look.

Take the clutch cover off and review the linkage from the clutch throwout mechanism that ducks off on the right side of the case. That controls the interlock.

A 1953 933[attachment=55232]img013.jpg[/attachment]

Have you changed the trans oil? Water can migrate into the case and rust the works. The gears slide a fair ways on splined shafts to engage, so they could have rusted a bit. Seems to be a common occurrence for machines left sitting outside, especially if someone was working on it years past and didn't secure covers well, or replace needed gaskets. What is your ser#? Pics#
When you say sloppy, what part? The linkage or is the stick able to move up & down?

Have you changed the trans oil? Water can migrate into the case and rust the works. The gears slide a fair ways on splined shafts to engage, so they could have rusted a bit. Seems to be a common occurrence for machines left sitting outside, especially if someone was working on it years past and didn't secure covers well, or replace needed gaskets. What is your ser#? Pics#
When you say sloppy, what part? The linkage or is the stick able to move up & down?

Just been dealing with this on a D6 9u. Tractor sat a lot of years on top a mountain with a seized engine. Got the lever moving 3 years ago. Finally got new boot, blew rust out of top linkage but very stiff to move,poured louse juice in last fall.I used a hammer break rust up.Got back to it last week,just barely moved. So poured a quart of oil into it made sure it would go in all 5 gears(moving transmission on the u joint helped). Hoping to start and run soon,but who knows if it stays on the top of my to do list.



So make sure the transmission inter lock is free,and spend time lubing moving lever if there is any movement in it.

Since you had engine running was it grinding like the clutch brake was not working, or there is no movement of lever at all.

Also you did push the clutch ahead? Cause if you have been around any Johnny Poppers you first inclination would to pull it to release.

Here are some pics of inside the transmission, this one has the rusty shafts. See the view of with the spring, that is part of the detent linkage that must operate to allow the shift rails to both move when needed, and lock when the clutch is engaged.
If you have to remove the cover from the top of the transmission to break up some stuck parts, it's not very hard to do.

Thanks so much for the info...I will try to get to the dozer this weekend unless I get rained out.
I am not sure of the serial number I do have it written down...just can't find it at the moment.It is a 1949 D25U

So I made it out this weekend ...I soaked the rods with the oil in the transmission and did get things moving but it would only go into 5th...So I am going to let it sit for a week or 2 and hopefully I can get it to go into some lower gears...Since I didn't want to beat on it.The middle rod moved pretty easy the 2 side ones took a bit to move.
The serial number was 5U1650